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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/indices-clearcache.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/indices-clearcache.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/indices-clearcache.html" rel="nofollow" target="_blank">../en/indices-clearcache.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<div class="section">
<div class="titlepage"><div><div>
<h2 class="title">
<a id="indices-clearcache"></a>Clear cache API<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/indices/clearcache.asciidoc">edit</a>
</h2>
</div></div></div>

<p>Clears caches for one or more indices.</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">POST /twitter/_cache/clear</pre>
</div>
<div class="console_widget" data-snippet="snippets/1609.console"></div>
<div class="section">
<div class="titlepage"><div><div>
<h3 class="title">
<a id="clear-cache-api-request"></a>Request<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/indices/clearcache.asciidoc">edit</a>
</h3>
</div></div></div>
<p><code class="literal">POST /&lt;index&gt;/_cache/clear</code></p>
<p><code class="literal">POST /_cache/clear</code></p>
</div>

<div class="section">
<div class="titlepage"><div><div>
<h3 class="title">
<a id="clear-cache-api-path-params"></a>Path parameters<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/indices/clearcache.asciidoc">edit</a>
</h3>
</div></div></div>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="literal">&lt;index&gt;</code>
</span>
</dt>
<dd>
(Optional, string) Comma-separated list or wildcard expression of index names
used to limit the request.
</dd>
</dl>
</div>
</div>

<div class="section">
<div class="titlepage"><div><div>
<h3 class="title">
<a id="clear-cache-api-query-params"></a>Query parameters<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/indices/clearcache.asciidoc">edit</a>
</h3>
</div></div></div>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="literal">allow_no_indices</code>
</span>
</dt>
<dd>
<p>
(Optional, boolean) If <code class="literal">true</code>,
the request does <span class="strong strong"><strong>not</strong></span> return an error
if a wildcard expression
or <code class="literal">_all</code> value retrieves only missing or closed indices.
</p>
<p>This parameter also applies to <a class="xref" href="indices-aliases.html" title="Update index alias API">index aliases</a>
that point to a missing or closed index.</p>
<p>Defaults to <code class="literal">true</code>.</p>
</dd>
<dt>
<span class="term">
<code class="literal">expand_wildcards</code>
</span>
</dt>
<dd>
<p>(Optional, string) Controls what kind of indices that wildcard expressions can
expand to. Multiple values are accepted when separated by a comma, as in
<code class="literal">open,hidden</code>. Valid values are:</p>
<div class="variablelist">
<dl class="variablelist">
<dt>
<span class="term">
<code class="literal">all</code>
</span>
</dt>
<dd>
Expand to open and closed indices, including <a class="xref" href="index-modules.html#index-hidden">hidden indices</a>.
</dd>
<dt>
<span class="term">
<code class="literal">open</code>
</span>
</dt>
<dd>
Expand only to open indices.
</dd>
<dt>
<span class="term">
<code class="literal">closed</code>
</span>
</dt>
<dd>
Expand only to closed indices.
</dd>
<dt>
<span class="term">
<code class="literal">hidden</code>
</span>
</dt>
<dd>
Expansion of wildcards will include <a class="xref" href="index-modules.html#index-hidden">hidden indices</a>.
Must be combined with <code class="literal">open</code>, <code class="literal">closed</code>, or both.
</dd>
<dt>
<span class="term">
<code class="literal">none</code>
</span>
</dt>
<dd>
Wildcard expressions are not accepted.
</dd>
</dl>
</div>
<p>Defaults to <code class="literal">open</code>.</p>
</dd>
<dt>
<span class="term">
<code class="literal">fielddata</code>
</span>
</dt>
<dd>
<p>(Optional, boolean)
If <code class="literal">true</code>,
clears the fields cache.</p>
<p>Use the <code class="literal">fields</code> parameter
to clear the cache of specific fields only.</p>
</dd>
<dt>
<span class="term">
<code class="literal">fields</code>
</span>
</dt>
<dd>
<p>(Optional, string)
Comma-separated list of field names
used to limit the <code class="literal">fielddata</code> parameter.</p>
<p>Defaults to all fields.</p>
<div class="note admon">
<div class="icon"></div>
<div class="admon_content">
<p>This parameter does <span class="strong strong"><strong>not</strong></span> support objects
or field aliases.</p>
</div>
</div>
</dd>
<dt>
<span class="term">
<code class="literal">index</code>
</span>
</dt>
<dd>
(Optional, string)
Comma-separated list of index names
used to limit the request.
</dd>
<dt>
<span class="term">
<code class="literal">ignore_unavailable</code>
</span>
</dt>
<dd>
(Optional, boolean) If <code class="literal">true</code>, missing or closed indices are not included in the
response. Defaults to <code class="literal">false</code>.
</dd>
<dt>
<span class="term">
<code class="literal">query</code>
</span>
</dt>
<dd>
(Optional, boolean)
If <code class="literal">true</code>,
clears the query cache.
</dd>
<dt>
<span class="term">
<code class="literal">request</code>
</span>
</dt>
<dd>
(Optional, boolean)
If <code class="literal">true</code>,
clears the request cache.
</dd>
</dl>
</div>
</div>

<div class="section">
<div class="titlepage"><div><div>
<h3 class="title">
<a id="clear-cache-api-example"></a>Examples<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/indices/clearcache.asciidoc">edit</a>
</h3>
</div></div></div>
<div class="section">
<div class="titlepage"><div><div>
<h4 class="title">
<a id="clear-cache-api-specific-ex"></a>Clear a specific cache<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/indices/clearcache.asciidoc">edit</a>
</h4>
</div></div></div>
<p>By default,
the clear cache API clears all caches.
You can clear only specific caches
by setting the following query parameters to <code class="literal">true</code>:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
<code class="literal">fielddata</code>
</li>
<li class="listitem">
<code class="literal">query</code>
</li>
<li class="listitem">
<code class="literal">request</code>
</li>
</ul>
</div>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">POST /twitter/_cache/clear?fielddata=true  <a id="CO565-1"></a><i class="conum" data-value="1"></i>
POST /twitter/_cache/clear?query=true      <a id="CO565-2"></a><i class="conum" data-value="2"></i>
POST /twitter/_cache/clear?request=true    <a id="CO565-3"></a><i class="conum" data-value="3"></i></pre>
</div>
<div class="console_widget" data-snippet="snippets/1610.console"></div>
<div class="calloutlist">
<table border="0" summary="Callout list">
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO565-1"><i class="conum" data-value="1"></i></a></p>
</td>
<td align="left" valign="top">
<p>Clears only the fields cache</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO565-2"><i class="conum" data-value="2"></i></a></p>
</td>
<td align="left" valign="top">
<p>Clears only the query cache</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO565-3"><i class="conum" data-value="3"></i></a></p>
</td>
<td align="left" valign="top">
<p>Clears only the request cache</p>
</td>
</tr>
</table>
</div>
</div>

<div class="section">
<div class="titlepage"><div><div>
<h4 class="title">
<a id="clear-cache-api-specific-fields-ex"></a>Clear the cache of specific fields<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/indices/clearcache.asciidoc">edit</a>
</h4>
</div></div></div>
<p>To only clear the cache of specific fields,
use the <code class="literal">fields</code> query parameter.</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">POST /twitter/_cache/clear?fields=foo,bar   <a id="CO566-1"></a><i class="conum" data-value="1"></i></pre>
</div>
<div class="console_widget" data-snippet="snippets/1611.console"></div>
<div class="calloutlist">
<table border="0" summary="Callout list">
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO566-1"><i class="conum" data-value="1"></i></a></p>
</td>
<td align="left" valign="top">
<p>Clear the cache for the <code class="literal">foo</code> and <code class="literal">bar</code> field</p>
</td>
</tr>
</table>
</div>
</div>

<div class="section">
<div class="titlepage"><div><div>
<h4 class="title">
<a id="clear-cache-api-multi-ex"></a>Clear caches for several indices<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/indices/clearcache.asciidoc">edit</a>
</h4>
</div></div></div>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">POST /kimchy,elasticsearch/_cache/clear</pre>
</div>
<div class="console_widget" data-snippet="snippets/1612.console"></div>
</div>

<div class="section">
<div class="titlepage"><div><div>
<h4 class="title">
<a id="clear-cache-api-all-ex"></a>Clear caches for all indices<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/indices/clearcache.asciidoc">edit</a>
</h4>
</div></div></div>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">POST /_cache/clear</pre>
</div>
<div class="console_widget" data-snippet="snippets/1613.console"></div>
</div>

</div>

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